Electrical ignition system for internal combustion engines



ELECTRIQAL IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES M.. RALL Oct.20, 1931.

Filed June 29, 1928 2 Sheets-Sheet 1 Oct. 20, 1931. M. RALL 1,828,620

ELECTRICAL IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES Filed June29, 1928 2 sheets-sheet 2 nected to this battery Patented Oct. 20, 1931,

' UNITED STATES PATENT: orrlcs m nan, or sru'r'reur, enmity, assr'euon'ro nonnarnoscn 'AKTIENGmor s'rwrzreaar, omsmr I WQAL IGHITION SYQTEMFOR INTERNAL COMBUSTION ENGINES Application ma June 20, ms, Serial no.

In internal'combustion'engines fitted with an electric starter, theaccumulator battery connected to the dynamo usually has a voltage of 12volts, and under certain circumstances even 24 volts.v If electricallyheated incandescent wire plugs are used for ignition, particularly onstarting, and these, are connected up to such accumulators,.it necessaryto insert in the accumulator circuit 1b a resistance in series with theincandescent wires owing to their low resistance, and this causes aconsiderable loss ofenergy from the battery during the discharge eriods.In order to avoid this loss the incan escent-wire plugs are, accordingto the invention, su s plied from an additional accumulator, t e voltageof which is lower than that of the accumulator battery provided for thestarting motor, and which is connected to the dyao namo through anautomatic switch and a voltage reducing element.

Three to s of construction of the invention adapted for use on motorvehicles are shown in the accompanying drawings by way of example. I r fv Figure Ishows the wiring diagram eta system having twoautomaticswitches. Figures 2 and 3 show the wiring diagrams of two difierentsystemshaving a single autoso matic switch. v InFigure 1 the systemconsists of the dyn'amo 1, the starting motor 2,- switch box 3, leadplate accumulator battery 4, supplying current at for example 12 voltstential, the two head light "lam 5 and t e automatic ,Qswitch 6 betweene dynamo land the switch box 3. An-aocumulator battery consistin of twoEdison cells 9 connected in pa el, the ave discharge volta of whichamounts to 1. volts, is contact; with the dynamo through a secondautomatic switch -7 and an incandescentlam 8. incandescent .wireignitionplugs 1 are con- 9,-9 through a handoperated switch 10.

The incandescent lamp 8 reduces the volt-' age of'the current supghed bythe dynamo 1 to tke value-suitazahlerBthe 1two eelltigtatilildattesametime ows ygowing e leeells9arecharged. a I

289,166, and in Germany July 14, 1927.

The two Edison cells 9, automatic switch 7 and incandescent lamp 8 arepreferably the side of the vehicle as a single Figure 1, are replaced inFigure 2 by a single automatic switch 12, the armature 13 of whichcarries'two contacts 14 and 15 separated by common contact 16 isconnected up with the dynamo 1.

Figure 3 shows a' further system in which an ordinary automatic switchis used in con junction with a switch box ofthe type usual inmotorvehicle, illumination. Two conan insulated member 17. The contact 14 istacts 18 and 19 are provided in the switch box 3 on the lead passingfrom the automatic switch 6 to the main accumulator battery 4 and twoterminals 20 and 21 are also provided therein, the terminal 20 beingconnected to the lead through the lamp 8 to the auxiliary accumulator 9,and the terminal '21 to the lead from the starting motor 2 through astarter press-button switch 22. Contact springs 23 and 24 are providedwhich are adapted to cooperate with the con tacts 18 and 19. The twocontact springs 23 and 24 are actuated bymeans of a cam 26 rotatableabout an axis 25. In the open position shown, the two contact springs 23bearing against the switch cam 26 are awa from their res 'tive contacts18 and 19' so t at the leads to th the starting press button switch 22and also to the auxiliarybattery 9 are cut out. I v

When the switch cam, 26 is turned through 909, the two contact springs23 and 24 are forcedagainst the contacts 18 and ,19 and the engine canbe started by de ressing thestarter button 22 after closingtiieincandescent plug switch 10. As soon as the engine has started, thestarter button 22 is again released whilst the plug switch 10 for theincandescent wire plugs remains closed until the engine can run onself-i 'tion.

' On stetapping the engine t e switch 25, 26 is. turn ac shown, so t themain-accumulator b hand .to the position of battery 4 cannot dischargethrough the auxiliary accumulator 9.

This arrangement ensures that the auxiliary ,o,ccumulator 9 can becharged while the engine is running. When the engine is at rest theglowing of the lamp 8 indicates that the switch 25, 26 must be turnedoif.

A single larger Edison cell or a lead plate cell maybe used instead ofthe two Edison cells. When using the lead plate cell a suitable smallresistance is preferably inserted before the incandescent wire plugowing to its slightly higher Voltage.

I claim: I

1. An electrical ignition system for internal combustion enginescomprising in combination a dynamo, a starting motor, an accumulatorbattery and connections forcha-rging said battery from said dynamo, acircuit for operating said starting motor from said battery, a pluralityof incandescent-wire ignition plugs, an auxiliary accumulator-of lessvoltage than the first mentioned accumulator battery, a circuit forenergizing said plugs from said auxiliary accumulator, means to make andbreak said energizing circuit, and connections including an automaticswitch for charging said auxiliary accumulator from said dynamo.

2. An electrical ignition system for internal combustion enginescomprising in combination a dynamo, a starting motor, an accumulatorbattery and connections for charging said battery from said dynamo, acircuit for operating said starting motor from said battery, a pluralityof incandescentwire ignition plugs, an auxiliary accumulator of lessVoltage than the first mentioned accumulator battery, a circuit forenergizing said plugs from said auxiliary accumulator, means to make andbreak said energizing circuit, connections including an automatic switchfor charging said auxiliary accumulator from said dynamo, and aresistance in the connections between said auxiliary ac- -cumulator andsaid dynamo for reducing the nal combustion engines comprising in com- Ibination a dynamo, a starting motor, an accumulator battery andconnections for charg- I ing said battery from saiddynamo, a circuit foroperating said starting motor from said battery, a plurality ofincandescent-wire ignition plugs, an auxiliary accumulator of lessvoltage than the first mentioned accumulator battery, a circuit forenergizing said plugs from said auxiliary accumulator, a circuit forcharging said auxiliary accumulator fromsaid dynamo,a pair of mutuallyinlator battery, and a common automatic it switch controlling saidcontacts. I

4. An electrical ignition system for internal combustion enginescomprising in combination a dynamo, a starting motor, an accumulatorbattery and a circuit for char ing said battery from said dynamo, acircuit for operating said starting motor from said battery, a pluralityof incandescent-wireignition plugs, an auxiliary accumulator of lessvoltage than the first mentioned accumulator battery, a circuit forenergizing said plugs from said auxiliary accumulator, a circuitfor-charging said auxlhary accumufixed my signature.

MAX RALL.

